I have been planting as many plants as I can find for bees and other pollinators. These have been the most successful this year:
Sedums
Alliums, both ornamental and culinary (when allowed to flower)
Asters
Helianthus 'Lemon Queen'
Veronicastrum 'Fascination'
Perovskia 'Blue Spires'
Agastache 'Blue Fortune'
Agastache 'Golden Jubilee'
Calamintha nepeta ssp nepeta
Nepeta 'Joanna Reed'
Basil 'African Blue'
Scilla siberica
Hyacinthus 'Blue Festival'
I am sure I am forgetting many others. But when the sun is shining and the temperatures are warm enough, all of the plants mentioned above are swarming with a frenzy of activity.
